This issue should be tested in different browsers, specially in IE family.
Login as an admin user
Add the "Community finder" block to moodle frontpage
Click "Search" on the community finder block
Browse through the databases until you find a course with comments (I've found courses with comments in MOOCH + find: courses I can download + keywords: water)
Click on the "Comments (N)" you SHOULD be able to see a emerging overlay with the size of the text it contains

Description

Make sure that you are using Internet Explorer 8

1) Add the community finder block.
2) Do a search (MOOCH is good).
3) Select either courses I can enroll in or courses I can download then search.
4) Scroll down and find a course with a comment. Click and view.